If Violence Is A Singular Human Action Why Are Some Cultures More Predisposed To Violence Than Others?

I believe that in general the aggressiveness derives from the lack of necessities by some that desire to have what the others have . it is a normal behavior to want peace , but there always are going to be the ones that poses more envy than others , the ones with the envy are the aggressors , and the rest of the population has to take the penalties . If envy would not exist in the human behavior , peace would abound .